(www/R-bslib) Updated 0.3.1 to 0.4.2

# bslib 0.4.2

## Potentially breaking changes

* Upgraded Bootstrap 5 (i.e., `bs_theme(version = 5)`) from 5.1.3 to 5.2.2. (#438, #455)

## New features

* Adds a new `card()` API as well as `value_box()` and
  `layout_column_wrap()`. To learn more about this new functionality,
  refer to these new pkgdown articles:

  * https://rstudio.github.io/bslib/articles/cards.html
  * https://rstudio.github.io/bslib/articles/value-boxes.html
  * https://rstudio.github.io/bslib/articles/layouts.html

# bslib 0.4.1

## Bug Fixes

* Closed #458. This release `{bslib}` now requires `{memoise}` 2.0.1 or above.

# bslib 0.4.0

## Breaking changes

* `bs_theme()` now defaults to `version = 5` (i.e., Bootstrap 5). If
  this change happens to break an existing app, consider specifying
  `bs_theme(version = 4)` to revert the change in the Bootstrap
  version. (#374)

* The default coloring on some Bootswatch 4+ theme's
  `.navbar-default`/`.navbar-inverse` class has changed slightly to
  better match their Bootswatch 3 coloring. Also, since this coloring
  is now based solely on [`$navbar-*`
  variables](https://rstudio.github.io/bslib/articles/bs5-variables.html),
  Bootswatch themes now work better in combination with custom
  `$navbar-*` values (e.g., `bs_theme("navbar-bg" = ...)` can be used
  to provide the background color, and foreground colors will
  automatically contrast appropriately). (#392)

## New features

* Upgraded Bootstrap 5 (i.e., `bs_theme(version = 5)`) from 5.1.0 to 5.1.3 (#378)

* Closed #369: `bs_dependency_defer()` now memoises `func` (by
  default), reducing the time required to render multiple instances of
  the same [dynamically themable
  widget](https://rstudio.github.io/bslib/articles/custom-components.html#dynamically-themeable-component). (#405)

## Bug fixes

* Closed #393: Bootstrap 5's `$form-check-label-*` variables now work
  as expected with `shiny::radioButtons()`, `shiny::checkboxInput()`,
  and `shiny::checkboxGroupInput()`. (#395)

* Closed #382: Various fixes for using `shiny::checkboxInput()`,
  `shiny::checkboxGroupInput()`, and `shiny::radioButton()` with
  `bs_theme(version = 5, bootswatch = "sketchy")`. (#385)

* Closed #377: make sure `shiny::tabsetPanel(type = "hidden")` (i.e.,
  `bslib::navs_hidden()`) stays hidden when used with
  `bs_theme()`. (#379)

* Closed #424: fixed an issue with `nav_menu()` appearing first in a
  `navs_*()` container with Bootstrap 4+.

* Closed #431: Bootstrap 5 navbars no longer have an unwanted "Toggle
  Navigation" label when collapsed. (#432)

* Closed #400: `nav_menu(align="right")` now works with Bootstrap 5. (#401)

* Closed #390: using `bs_theme(bootswatch = "paper", version = 5)` or
  `bs_theme(bootswatch = "readable", version = 5)` no longer
  errors. (#391)

(mef)